python - cProfile not running

Question

I was trying to run a performance test of my code using cProfile, but sadly no matter how I tried cProfile refused to function properly. Here's what I did:

import cProfile
cProfile.run('addNum()')  # addNum() is a very simple function that adds a bunch of 
                          # numbers into a dictionary

and here's what I got:

Traceback (most recent call last):
File "C:\Program Files\Wing IDE 101 4.1\src\debug\tserver\_sandbox.py", line 1, in <module>
# Used internally for debug sandbox under external interpreter
File "C:\Python27\Lib\cProfile.py", line 36, in run
result = prof.print_stats(sort)
File "C:\Python27\Lib\cProfile.py", line 81, in print_stats
pstats.Stats(self).strip_dirs().sort_stats(sort).print_stats()
File "C:\Python27\Lib\pstats.py", line 81, in __init__
self.init(arg)
File "C:\Python27\Lib\pstats.py", line 95, in init
self.load_stats(arg)
File "C:\Python27\Lib\pstats.py", line 124, in load_stats
self.__class__, arg)
TypeError: Cannot create or construct a <class pstats.Stats at 0x01AE9CA8> object from '<cProfile.Profile object at 0x01ACC470>''

Can someone help me debug this, and hopefully provide a solution?

I'm running Python 2.7.3 on Wing IDE 101 ver4.1.

Thank you!!!

Answer 1

This seems like a problem with the pStats module and not the cProfile.

can you try doing

import pstats

If this says cannot import pstats, then try installing the python-profiler again. It comes with python itself but that might be messed up in your case IF pstats is not there.

It's a simple apt-get on linux, so I am assuming windows would have a separate binary for python-profiler too.

Hope this helps!

Answer 2

I've had the same problem with Python 3.5.2 today:

What ended up working was replacing the call which I want to profile like this, then running the whole program:

import cProfile
# myObject.myFunc()
cProfile.runctx('myObject.myFunc()', globals(), locals(), 'myFunc.stat')

Finally, in an interactive python3 running separately, I did:

>>> import pstats
>>> p = pstats.Stats('myFunc.stat')
>>> p.strip_dirs().sort_stats(-1).print_stats()
Wed Feb 20 17:10:05 2019    myFunc.stat

         10218759 function calls (3916491 primitive calls) in 16.519 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000   16.519   16.519 <string>:1(<module>)
   ... the really useful stats followed here ...

The cProfile.runctx(...), globals(), locals() were necessary to fix a NameError I ran into; the TypeError which you asked about was fixed by specifying a file name to store the stats into, which is also available via the normal cProfile.run(...)